Gingrich has struggled to maintain momentum in the Republican presidential primary after winning the South Carolina primary in late January — a victory thanks in part to Winning Our Future’s heavy spending in the Palmetto State.

The former House speaker looks to make what could be his last stand during the March 6 Super Tuesday primary and caucus contests, when his home state of Georgia is in play along with nine other states.

After the Adelsons, the next biggest donation to Winning Our Future – $500,000 – came from Dallas billionaire Harold Simmons, matching a donation he gave for that amount to the super PAC late last year.

Simmons, long a top donor to conservative causes, is spreading his donations widely among GOP-allied super PACs this cycle, also giving $100,000 last month to the super PAC supporting Gingrich rival Mitt Romney.

And that’s on top of donations he gave last year of $7 million to the Karl Rove-linked American Crossroads, and $1 million to the super PAC that supported Rick Perry’s since-aborted presidential campaign.

The only other large donations came from Margaret C. Caveney, a South Florida retiree who gave $250,000; Michael E. Martino, a Connecticut investor who gave $100,000, and Stephen Muss, a Miami real estate developer who gave $50,000.

The remaining 103 donors gave a total of $56,251. Winning Our Future did not accept any corporate contributions in January, although super PACs are allowed to do so.

As the Adelsons have sent mixed signals about whether they intend to continue donating to the super PAC, its officials indicated they intended to broaden its donor base.

The Monday report shows that it spent $216,000 on fundraising. But $156,000 of that went to Becky Burkett, a former Gingrich aide who helped a now-defunct Gingrich political group raise $7 million from Adelson. Another $50,000 went to a Purcelville, Va., firm called Foundry Road, LLC, while $10,000 was paid to a San Francisco firm called Piryx Inc.

Gregg A. Phillips of Austin, Texas, also received $90,000 in January for “consulting” and “strategic planning” service.